package com.retailshop.shopfinace.common;


import com.alibaba.fastjson.JSONObject;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.retailshop.shopfinace.entity.HttpRequestConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Method;

public class AuthenticationInterceptor implements HandlerInterceptor {
       Logger logger= LoggerFactory.getLogger(AuthenticationInterceptor.class);

    @Resource
    HttpRequestConfig requestConfig;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {

        String token = httpServletRequest.getHeader("token");// 从 http 请求头中取出 token

        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            logger.info("没有映射到方法直接通过！");
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                logger.info("检查有passtoken注释，则跳过认证");
                return true;
            }
        }
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                    logger.info("执行认证,token为空！");
                    String jsonObjectStr = JSONObject.toJSONString(new Response(MessageConstants.TOKEN_UNEXIT, null, 0, "", httpServletRequest));
                    returnResult(httpServletResponse, jsonObjectStr);
                    return false;
                }

                // 获取 token 中的 user id
                String userId=null;
                try {
                    userId = JWT.decode(token).getAudience().get(0);
                } catch (JWTDecodeException j) {
                    logger.info("获取 token 中的 user id");
                    j.printStackTrace();
                    String jsonObjectStr = JSONObject.toJSONString(new Response(MessageConstants.TOKEN_ERROR, null, 0, "", httpServletRequest));
                    returnResult(httpServletResponse, jsonObjectStr);
                }

                String url = requestConfig.getUserServerUrl()+"/wap/getUserNoIdInfoByUserNoId";
                String userNoId = "userNoId=" + userId;
                String result = HttpRequest.sendGet(url, userNoId);

                System.out.println(result);

                String userNoIds = null;
                JSONObject str = JSONObject.parseObject(result);
                JSONObject strData = JSONObject.parseObject(str.get("data").toString());
                userNoIds = strData.get("id").toString();
//                pwd = strData.get("pwd").toString();
                if (userNoIds == null) {
                    logger.info("token用户不存在！");
                    String jsonObjectStr = JSONObject.toJSONString(new Response(MessageConstants.MSG_USER_INEXISTENCE, null, 0, "", httpServletRequest));
                    returnResult(httpServletResponse, jsonObjectStr);
                    return false;
                }

                System.out.println("A 验证 token");

                // 验证 token
                String pwd = "xlsyear2019";
                JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(pwd)).build();
                try {
                    jwtVerifier.verify(token);
                } catch (JWTVerificationException e) {
                        logger.info("token验证错误！");
                    String jsonObjectStr = JSONObject.toJSONString(new Response(MessageConstants.TOKEN_VERIFY, null, 0, "", httpServletRequest));
                    returnResult(httpServletResponse, jsonObjectStr);
                    e.printStackTrace();
                    return false;
                }
                return true;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
                           HttpServletResponse httpServletResponse,
                           Object o, ModelAndView modelAndView) throws Exception {


    }


    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest,
                                HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {


    }

    private void returnResult(HttpServletResponse response, String str) throws Exception {
        PrintWriter writer = null;
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html; charset=utf-8");
        response.setHeader("Access-Control-Allow-Origin", "*");
        try {
            writer = response.getWriter();
            writer.print(str);

        } catch (IOException e) {

        } finally {
            if (writer != null)
                writer.close();
        }
    }


}
